Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas velocidades upstream existem para downstream de 20 mbit/s e largura de banda de 40 gb?
 ###Tabelas: CREATE TABLE end-user_power_tariffs (end-user_power_tariffs_id AUTO_INCREMENT PRIMARY KEY, User VARCHAR, Unit (kWh)/Time range VARCHAR, Tariff ( Rs. /kWh) VARCHAR, Fixed Charge ( Rs. /kWh) VARCHAR, Fuel Adjustment Charge (% of Total Energy Charge) VARCHAR, Max. Demand Charge ( Rs. /kVA) VARCHAR) CREATE TABLE singles:_26_16_titles_10_runners-up (singles:_26_16_titles_10_runners-up_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score in the final VARCHAR) CREATE TABLE changes_during_term (changes_during_term_id AUTO_INCREMENT PRIMARY KEY, By-election INT, Electorate VARCHAR, Date VARCHAR, Incumbent VARCHAR, Reason VARCHAR, Winner VARCHAR) CREATE TABLE turkey (turkey_id AUTO_INCREMENT PRIMARY KEY, Downstream VARCHAR, Upstream VARCHAR, Bandwidth VARCHAR, Price TL VARCHAR, Every 1 GB VARCHAR, MAX VARCHAR) CREATE TABLE singles:_19_finals_8_titles_11_runner-ups (singles:_19_finals_8_titles_11_runner-ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Opponent in the final VARCHAR, Score in the final VARCHAR)  
SELECT COUNT Upstream FROM turkey WHERE Downstream = 20 Mbit/s AND Bandwidth = 40 GB